Ultrashort wave frequency hopping signal parameter blind estimation method

Abstract

The invention discloses an ultrashort wave frequency hopping signal parameter blind estimation method, which is high in signal detection probability, strong in anti-noise capability and high in parameter estimation precision. According to the technical scheme, signals outputted by an antenna enter an ultra-short wave channel to be subjected to frequency mixing, filtering and amplification, output intermediate-frequency analog signals pass through an analog-to-digital conversion module, band-pass AD sampling is carried out according to the sampling theorem, digital down-conversion, extraction and filtering preprocessing are carried out on the intermediate-frequency sampling signals in an FPGA, one path of obtained broadband baseband IQ signal is divided into two paths, the IQ signal is windowed through two paths of conversion channels with 50% sampling overlap, and the processed IQ signal is sent to FFT operation processing modules on the two paths to complete fast Fourier transform operation; the frequency hopping signal detection module performs over-threshold detection on an input frequency spectrum signal, estimates a frequency hopping signal parameter meeting a screening condition, forms a pulse description word (PDW), and sends the PDW to the rear-end signal processing module.

Description

technical field [0001] The invention relates to a technique for receiving, collecting, detecting and estimating parameters of ultrashort wave frequency hopping signals, and a method for blindly estimating parameters of ultrashort wave frequency hopping signals. Background technique [0002] Shortwave communication has many significant advantages. Compared with satellite communication, terrestrial microwave, coaxial cable, optical fiber and other communication methods, shortwave communication can realize long-distance communication without establishing a relay station. It has the advantages of simple equipment, short construction period and easy maintenance. Features: It can not only carry out fixed communication, but also carry out mobile communication such as vehicle, airborne, and shipborne; it is convenient for temporary networking, and it has strong anti-destruction ability against natural disasters or wars; the communication equipment is small in size, easy to conceal, a...

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Problems solved by technology

However, these methods can only estimate part of the frequency hopping parameters, and cannot achieve true blind estimation

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